Headphone volume on media playback

I am not sure if this is an issue on my phone or normal behavior, but I feel like the volume of the media being played back through the headphone jack is too low, even at maximum setting. I tried a few different headphones (including the Motorola branded ones that came with my Razr as a promo) and a few different apps (podkicker and doubleTwist). Still even at max volume, when i am walking down the street, a bus driving by drowns out whatever I am listening to. Anybody else have this issue?